ref: 53fa826a8a695bcfade5c47f636f719c71e96b98
dir: /sys/src/cmd/jpg/png.c/
#include <u.h> #include <libc.h> #include <bio.h> #include <draw.h> #include <event.h> #include <keyboard.h> #include "imagefile.h" extern int debug; int cflag = 0; int dflag = 0; int eflag = 0; int nineflag = 0; int threeflag = 0; int output = 0; ulong outchan = CMAP8; Image *image; int defaultcolor = 1; enum{ Border = 2, Edge = 5 }; char *show(int, char*, int); Rectangle imager(Image *i) { Point p1, p2; p1 = addpt(divpt(subpt(i->r.max, i->r.min), 2), i->r.min); p2 = addpt(divpt(subpt(screen->clipr.max, screen->clipr.min), 2), screen->clipr.min); return rectaddpt(i->r, subpt(p2, p1)); } void eresized(int new) { Rectangle r; if(new && getwindow(display, Refnone) < 0){ fprint(2, "png: can't reattach to window\n"); exits("resize"); } if(image == nil) return; r = imager(image); border(screen, r, -Border, nil, ZP); draw(screen, r, image, nil, image->r.min); flushimage(display, 1); } void main(int argc, char *argv[]) { int fd, i; char *err; ARGBEGIN{ case 'c': /* produce encoded, compressed, bitmap file; no display by default */ cflag++; dflag++; output++; if(defaultcolor) outchan = CMAP8; break; case 'D': debug++; break; case 'd': /* suppress display of image */ dflag++; break; case 'e': /* disable floyd-steinberg error diffusion */ eflag++; break; case 'k': /* force black and white */ defaultcolor = 0; outchan = GREY8; break; case '3': /* produce encoded, compressed, three-color bitmap file; no display by default */ threeflag++; /* fall through */ case 't': /* produce encoded, compressed, true-color bitmap file; no display by default */ cflag++; dflag++; output++; defaultcolor = 0; outchan = RGB24; break; case 'v': /* force RGBV */ defaultcolor = 0; outchan = CMAP8; break; case '9': /* produce plan 9, uncompressed, bitmap file; no display by default */ nineflag++; dflag++; output++; if(defaultcolor) outchan = CMAP8; break; default: fprint(2, "usage: png [-39cdekrtv] [file.png ...]\n"); exits("usage"); }ARGEND; err = nil; if(argc == 0) err = show(0, "<stdin>", outchan); else{ for(i=0; i<argc; i++){ fd = open(argv[i], OREAD); if(fd < 0){ fprint(2, "png: can't open %s: %r\n", argv[i]); err = "open"; }else{ err = show(fd, argv[i], outchan); close(fd); } if((nineflag || cflag) && argc>1 && err==nil){ fprint(2, "png: exiting after one file\n"); break; } } } exits(err); } char* show(int fd, char *name, int outc) { Rawimage **array, *r, *c; Image *i, *i2; int j, ch, outchan; Biobuf b; char buf[32]; static int inited; if(Binit(&b, fd, OREAD) < 0) return nil; outchan = outc; array = Breadpng(&b, CRGB); if(array == nil || array[0]==nil){ fprint(2, "png: decode %s failed: %r\n", name); return "decode"; } Bterm(&b); r = array[0]; if(!dflag){ if (!inited) { if(initdraw(0, 0, 0) < 0){ fprint(2, "png: initdraw failed: %r\n"); return "initdraw"; } einit(Ekeyboard|Emouse); inited++; } if(defaultcolor && screen->depth>8 && outchan==CMAP8) outchan = RGB24; } if(outchan == CMAP8) c = torgbv(r, !eflag); else{ switch(r->chandesc){ case CY: outchan = GREY8; break; case CYA16: outchan = CHAN2(CGrey, 8, CAlpha, 8); break; case CRGB24: outchan = RGB24; break; case CRGBA32: outchan = RGBA32; break; } c = r; } if(c == nil){ fprint(2, "png: conversion of %s failed: %r\n", name); return "torgbv"; } if(!dflag){ i = allocimage(display, c->r, outchan, 0, 0); if(i == nil){ fprint(2, "png: allocimage %s failed: %r\n", name); return "allocimage"; } if(loadimage(i, i->r, c->chans[0], c->chanlen) < 0){ fprint(2, "png: loadimage %s of %d bytes failed: %r\n", name, c->chanlen); return "loadimage"; } i2 = allocimage(display, c->r, outchan, 0, 0); draw(i2, i2->r, display->black, nil, ZP); draw(i2, i2->r, i, nil, i->r.min); image = i2; eresized(0); if((ch=ekbd())=='q' || ch==Kdel || ch==Keof) exits(nil); draw(screen, screen->clipr, display->white, nil, ZP); image = nil; freeimage(i); } if(nineflag){ chantostr(buf, outchan); print("%11s %11d %11d %11d %11d ", buf, c->r.min.x, c->r.min.y, c->r.max.x, c->r.max.y); if(write(1, c->chans[0], c->chanlen) != c->chanlen){ fprint(2, "png: %s: write error %r\n", name); return "write"; } }else if(cflag){ if(writerawimage(1, c) < 0){ fprint(2, "png: %s: write error: %r\n", name); return "write"; } } for(j=0; j<r->nchans; j++) free(r->chans[j]); free(r->cmap); free(r); free(array); if(c && c != r){ free(c->chans[0]); free(c); } return nil; }